UNO and Very Long Baseline Neutrino Oscillation Experiment
description
Transcript of UNO and Very Long Baseline Neutrino Oscillation Experiment
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UNO and
Very Long Baseline Neutrino Oscillation Experiment
Chiaki YanagisawaStony Brook
Talk at 3rd BNL/UCLA Workshop UCLA, California
February 28, 2005
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Detector ( Water Cherenkov)
Total mass: 650 ktons
Fiducial volume: 440 ktons for proton decays for solar 580 ktons for Supernova
Total size : 60x60x180 m3
Photocathode coverage: 1/3 40%, 2/3 10%
UNO● UNO
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History
-August, 2003: Proto-collaboration to collaboration
-Whitepaper , July 2002 presented at Snowmass, signed by 23 institutions, 49 members: proto-collaborators (22 institutions, 32 members: interest group)
-UNO Narrative for HEPAP 2003 report
UNO
-First EOI/R&D proposal 2005
-April 2004: The collaboration made of 40 institutions, 94 members, and 7 countries ( has grown since 2002)
Visit UNO website at http://nngroup.physics.sunysb.edu/uno/
- Proposed in 1999 at NNN99
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Physics Goals
- Nucleon decays- Atmospheric neutrinos- Supernova neutrinos- Solar neutrinos- Relic supernova neutrinos- Very long baseline neutrino oscillation- Others
UNO
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Proton Decays Proton decay rate limits/predictions
UNO
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Proton Decays Proton decay search sensitivities
UNO
with SK efficiency and background level
UNO ~10 years
UNO ~10 years
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Atmospheric Neutrinos L /E distribution to see oscillatory behavior
(sin2m2)=(1.0,3.0x10-3 eV)
UNO is much bigger than SK 20 x SK fiducial volume
UNO has much longer lever arm than SK, i.e., better efficiency to detect high energy muons than SK SK up to ~7 GeV UNO up to ~36 GeV
UNO
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Supernova Neutrinos
-For a SN at 10 kpc, UNO would detect 130,000 inverse beta decay events, 4,500 elastic scattering events, 4,500 neutral current events in the central region.
T= 8 MeV
T= 6 MeV
Neutral current events
- High statistics might lead to our first observation of the birth of a black hole- UNO is big enough to observe a supernova explosion even in Andromeda
Birth of a black hole
UNO
XvOv xx 16 where ,...,1515 NOX
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VLBNO
Setting the stage
e and
e +N->e + invisible N' + (invisible ns,n>=0)
e-> e'invisible ns,n>=0)
Look for single electron events
Major background
econtamination in beam (typically
0.7%)
How do we find the signal for e
UNO, ~ a half megaton F.V. water Cherenkov detector
BNL very long baseline neutrino beam
VLB neutrino oscillation experiment
See, for example, PRD68 (2003) 12002 for physics argument
● Very long baseline neutrino oscillation
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Spectra of on- and off-axis BNL Superbeams
on-axis beam
1 o off-axis beam
Neutrino energy (GeV)
s/
GeV
/m2 /
PO
TPRD68 (2003) 12002; private communication w/ M.Diwan
VLBNO
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VLBNO
How is analysis done ?
Use of SK atmospheric neutrino MC
Flatten SK atm. spectra and reweight with BNL beam spectra
Normalize with QE events: 12,000 events for events for beame for 0.5 Mt F.V. with 5 years of running, 2,540 km baseline
Reweight with oscillation probabilities for and for e
Standard SK analysis package +
m221
=7.3 x 10- 5 eV2, m231
=2.5 x 10- 3eV2
sin22ij(12,23,13)=0.86/1.0/0.04,
CP=+45,+135,-45,-135o
Probability tables from Brett Viren of BNL
Oscillation parameters used:
distance from BNL to Homestake
special 0 finder
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VLBNO
First comparison with BNL report
BNL report
My first study with full SK simulation
Compare with
Signal 303 events
All bkgs 146 ( 76 from) from
e)
All events:signal+bkg
All backgrounds
CP+45o
e QE for signal, all , e , NC 10for bkg
Based on 4-vector levelMC
Erec
Erec
Compare with
Signal 242 events
All bkgs 380 (324 from ) ( 56 from
e)
All events:signal+bkg
All backgrounds
CP+45o
CP+45o
Using traditional SKvariables + 0 mass;similar cuts to BNL cuts
Need improvement!
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VLBNO
Selection criteria to improve
Likelihood analysis using the following eight variables:
Initial cuts: One and only one electron like ring with energy and reconstructed neutrino energy more than 100 MeV without any decay electron
mass, energy fraction, costh, -likelihood, e-likelihood
-likelihood, total charge/electron energy, Cherenkov angle
To reduce events with invisiblecharged pions
Traditional SK cuts only
With finder
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VLBNO
eeN
eNrec
Em
EmE
)cos1(
Neutrino energy reconstruction
What is sources of the signal?
QE
e
pn
e
e
Ee
nonQEsingle ring
QE events give the best energy resolution but……
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VLBNO
What are sources of the signal and of the background?
QE events onlybefore likelihood cut
All CC eventsbefore likelihood cut
Erec Erec
Reconstructed energy Reconstructed energy
E EErec Erec
All CC events that survive the initial cuts are signals
What are sources of the signal? Single e-like events after initial cut
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0 finder
finder
detection efficiency with standard SK software
measured opening angle vs. mass with finder
m (MeV/c2) true opening angle (deg)
effi
cien
cy
open
ing
angl
e m
easu
red(
deg)
Single e-like events from single int. All single interactionsSK atm. neutrino spectra
Always finds an extra ring in a single ring event
inefficiencydue to overlap
inefficiency due toweak 2nd ring
● Finder
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efficiency
detection efficiency with standard SK + finder ef
fici
ency
All the single int.
True opening angle (deg)
finder
0 mass cut:1- and 2-ring events
0 mass cut:2-ring events
With atmospheric neutrino spectra
with 0 finder
without 0 finder
with 0 finderw/o 0 finder
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Variables
0.0-0.5 GeV
0.5-1.0 GeV
1.0-1.5 GeV 1.5-2.0 GeV
2.0-2.5 GeV 2.5-3.0 GeV
3.0-3.5 GeV 3.5-4.0 GeV
background
signal
0 mass
• Useful Variables All the distributions of useful variables are obtained withneutrino oscillation on with CPV phase angle +450
0 mass
0 mass 0 mass
0 mass
0 mass
0 mass
0 mass
0 mass
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Variables
0.0-0.5 GeV 0.5-1.0 GeV
1.0-1.5 GeV 1.5-2.0 GeV
2.0-2.5 GeV 2.5-3.0 GeV
3.0-3.5 GeV 3.5-4.0 GeV
background
signal
Energy fraction of 2nd ring Fake ring has less energy than real one
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Variables
Primary electron ring
An undetected weakring initially
- One algorithm optimized to find an extra ring near the primary ring (forward region)
- Another algorithm optimized to find an extra ring in wider space (wide region)
- See the difference ln -likelihood (forward) - ln -likelihood (wide)
Difference between log of two -likelihood (wide vs. forward)
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Variables
Difference between log of two -likelihood (wide vs. forward)
0.0-0.5 GeV 0.5-1.0 GeV
1.0-1.5 GeV 1.5-2.0 GeV
2.0-2.5 GeV 2.5-3.0 GeV
3.0-3.5 GeV 3.5-4.0 GeV
background
signal
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Variables
0.0-0.5 GeV 0.5-1.0 GeV
1.0-1.5 GeV 1.5-2.0 GeV
2.0-2.5 GeV 2.5-3.0 GeV
3.0-3.5 GeV 3.5-4.0 GeV
backgroundsignal
costh = cos e
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Preli
min
ary
Likelihood Cut
ln likelihood distributionsTrained with e CC events for signal, CC/NC & e NC for bkg
0.0-0.5 GeV 0.5-1.0 GeV
1.0-1.5 GeV 1.5-2.0 GeV
2.0-3.0 GeV 3.0- GeV
likelihood
likelihood
likelihood
likelihood
likelihood likelihood
signal
background
Difference in ln likelihood between sig and bkg
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Preli
min
ary
Likelihood Cut
Efficiency of a cut on ln likelihood ( signal vs background)
0.0-0.5 GeV 0.5-1.0 GeV
1.0-1.5 GeV 1.5-2.0 GeV
2.0-3.0 GeV 3.0- GeV
signal
background
likelihoodlikelihood
likelihood likelihood
likelihood
effi
cien
cyef
fici
ency
effi
cien
cy
effi
cien
cyef
fici
ency
effi
cien
cy
Trained with e CC events for signal, CC/NC & e NC for bkg
likelihood
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likelihood cut (100%signal retained)
Background from
CP+45o
Signal 700 ev Bkgs 2005 (1878 from +others) ( 127 from
e)
Signal
e backgroundo
CP+45
likelihood cut (~50%signal retained)
Effect of cut on likelihood
Erec Erec
Preliminary Preliminary
Signal/Background
Signal 321 ev Bkgs 169 (112 from +others) ( 57 from
e)
e CC for signal ; all e NC , e beam for background
TRADITIONAL ANALYSIS
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likelihood cut (40%signal retained)
Background from
CP+45o
Signal 251 ev Bkgs 118 ( 74 from +others) ( 44 from
e)
Signal
e background
oCP-45
likelihood cut (~40%signal retained) Effect of cut on likelihood
Erec Erec
Preliminary Preliminary
Signal/Background
Signal 142 ev Bkgs 118 ( 75 from +others) ( 43 from
e)
e CC for signal ; all e NC , e beam for backgrounds
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Effect of cut on likelihoodlikelihood cut (~40%signal retained)
Background from CP+135
o
Signal
e background
oCP-135
likelihood cut (~40%signal retained)
Erec Erec
Preliminary Preliminary
Signal/Background
Signal 342 ev Bkgs 126 ( 81 from +others) ( 45 from
e)
Signal 233 ev Bkgs 122 ( 78 from +others) ( 44 from
e)
e CC for signal ; all e NC , e beam for backgrounds
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Effect of cut on likelihoodCP +45o
Background All
oCP-45
Erec
Erec
Preliminary Preliminary
S/B
Erec
Erec
Erec Erec
e CC for signal ; all e NC , e beam for backgrounds
100% 50%
40%
50%100%
40%
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Effect of cut on likelihoodCP +135o
Background
All
oCP-135
Erec
Erec
Preliminary Preliminary
S/B
Erec
Erec
Erec Erec
100% 100%50% 50%
40% 40%
e CC for signal ; all e NC , e beam for backgrounds
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Preli
min
ary
Summary of BNL superbeam@UNO
CP phase Signal Bkg Signal Bkg Effic
0o e CC all, e NC 178 75
e CC 233 44
e CC 342 45
e CC
100% 700 1878
321 112
251 74
-135o
-45o
all, e NC
all, e NC
all, e NC
+135o
+45o
50%
40%
Beam e
43
78
81
142 75 43
40%
40%
40%
40%
127
57
44
e CC all, e NC
Signal/background
● S/B
with traditional water Chrenkov cuts
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Issues
• Granularity and efficiency
Expected improvement with UNO?
dete
ctio
n ef
fici
ency
finer granularity needed
For smaller opening angle
Compared with SK size detector
Minimum distance to wall in direction (m)
opening angle 0-20o
more granularity pixels efficiency improves when
min. distance increases (up to 20%)
See power of finderwith finder
without finder One issue I never mentioned before is that 2/3 of UNO volume is covered only 10% by PMTs and that we need to check the detector performance with 10% PMT coverage
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Conclusions● Conclusions
Realistic MC simulation studies have been performed for BNL very long baseline with a water Cherenkov detector and it was found that BNL VLB combined with UNO seems to DO GREAT JOB – Very exciting news but need confirmation It was demonstrated that there is some room to improve S/B ratio
beyond the standard water Cherenkov detector software with currently available software
We may need further improvement of algorithm/software, which is quite possible
A larger detector such as UNO has an advantage over a smaller detector such as SK (we learned a lesson from 1kt at K2K)
We need to do similar analysis using a MC package that simulates the UNO baseline design (2 x 10% + 40% coverage and size)
Detailed studies on sensitivity on oscillation parameters needed
A detailed Monte Carlo package for UNO is in preparation!
UNO has great potential for future physics and it is moving steadily with steady increase in the membership from 49 to 94
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Backup Slides
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Schedule
UNO
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Electron-like vs. muon-like ring
How do we detect atmospheric muon and electron neutrinos ?
electron-like ring
muon-like ring
+ n -> p +
e
+ n -> p +
e-
Major interactions:
Most of time invisible
Introduction
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efficiency
opening angle vs. measure 0 energy
measured0 energy (MeV)
Note: The energy spectrum of 0 is that of SK atm. interactions
0 mea
sure
d op
enin
g an
gle
(deg
)
0 finder
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Variables
costh = cos e
eeN
eNrec
Em
EmE
)cos1(
e
pn
e
e
Ee
N’N
e
E
undetected
It is not clear why the distributions ofcosth behave as shown in the following.My speculation:1) The signal events from QE scattering have larger e due to the Fermi motion of the target neutron in oxygen in the low energy region.2) For lower energy background events, the minimum opening angle is larger. In those events accepted as signal, 0 decay is very asymmetric and the primary carries most of the energy.
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Variables
e-likelihood
Found as an electron
Extra energy from anundetected weak ring
primary ring
- Two overlapped e-like rings identified as an e-like ring look like a fuzzier electron than an electron at lower energy
- At higher energy multiple particles go into a similar direction and identified as an e-like ring – could look less fuzzy than an electron
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Variables
e-likelihood
0.0-0.5 GeV 0.5-1.0 GeV
1.0-1.5 GeV 1.5-2.0 GeV
2.0-2.5 GeV 2.5-3.0 GeV
3.0-3.5 GeV 3.5-4.0 GeV
backgroundsignal
e-like
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Variables
Found as an electron
Extra energy from anundetected weak ring
0 likelihood tells whether an event is consistent with a single event
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Variables
0.0-0.5 GeV 0.5-1.0 GeV
1.0-1.5 GeV 1.5-2.0 GeV
2.0-2.5 GeV 2.5-3.0 GeV
3.0-3.5 GeV 3.5-4.0 GeV
background
signal
0 likelihood
more 0 like
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Variables
Measure Cherenkov angle
0.0-0.5 GeV 0.5-1.0 GeV
1.0-1.5 GeV 1.5-2.0 GeV
2.0-2.5 GeV 2.5-3.0 GeV
3.0-3.5 GeV 3.5-4.0 GeV
background
signal
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Variables
Total charge/primary ring energy (poa)
Found as an electron
Extra energy from anundetected weak ring
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VariablesUseful variables
0.0-0.5 GeV 0.5-1.0 GeV
1.0-1.5 GeV
2.0-2.5 GeV 2.5-3.0 GeV
3.0-3.5 GeV 3.5-4.0 GeV
background
signal
Total charge/primary ring energy (poa)
1.5-2.0 GeV
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likelihood cut (~40%signal retained)
Background from CP+45o
Signale background
oCP+45
likelihood cut (~40%signal retained)
Erec vs. E
Erec E
Preliminary Preliminary
S/Be CC for signal ; all e NC , e beam for bkg
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Preli
min
ary
Interaction mode
Sig Sig Sig
CC QE
0%
DIS
Others
Bkg
82%
3%
14%
1%
S/B
● Breakdown of interaction mode
Bkg Bkg
C
DIS
0<Erec<1 GeV 1<Erec<2 GeV 2<Erec<3 GeV 3 GeV<Erec
Sig Bkg
0%
0%
0%
39%
7%
3%
7%
0%
29%
11%
3%
0%
69%
5%
22%
3%
0%
0%
1%
68%
1%
8%
1%
1%
3%
9%
10%
0%
28%
11%
45%
15%
0%
0%
3%
23%
0%
0%
0%
18%
0%
59%
0%
0%
50%
8%
30%
13%
0%
0%
0%
25%
0%
0%
0%
0%
0%
75%
0%
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Preli
min
ary
Summary of BNL superbeam@UNOVariableremoved Signal Bkg Signal Bkg Effic
None e CC all, e, NC 321 112
e CC 321 59
e CC 316 56
e CC
50% 311 127
333 167
310 143
pi0lh
pi0-lh
poa
e-lh
50%
50%
Beam e
57
119
126
303 116 52
50%
50%
50%
50%
55
60
56
e CC
Issues
● S/B and variables
e CC
e CC
e CC 50%
efrac
pi0mass
costh 322 146 57
)(/ 0BS
2.86
1.80
2.51
2.61
2.53
1.99
2.17
2.21
Neutrino oscillation was on to define template distributionsFor analysis CPV=+45o
Some issues
all, e, NC
all, e, NC
all, e, NC
all, e, NC
all, e, NC
all, e, NC
all, e, NC
all, e, NC ange e CC 50% 321 119 55 2.70
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Future prospect
• Future prospect/plans
All the variables used to define the likelihood seem useful : any more?
Some variables associated with some pattern recognition such as -likelihood and e-likelihood seem quite useful
More sophisticated pattern recognition algorithm is desirable and possible
This kind of analysis can give an insight to optimize neutrino beam spectrum
Careful study of the source of background and the associated neutrino energy is needed
Studies on sensitivities to oscillation parameters should be done
What granularity UNO needs to have?
CC interactions in water need to be simulatedMy first guess is that the contribution from these interactions is not large because is mostly produced by DIS and in general there are many particles in the event(not a single ring event).